# operator+,-(ranges::slide_view::iterator)

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< cpp‎ | ranges‎ | slide view‎ | iterator

friend constexpr /*iterator*/ operator+( const /*iterator*/& i, difference_type n ) requires ranges::random_access_range<Base>; | (1) | (since C++23)
friend constexpr /*iterator*/ operator+( difference_type n, const /*iterator*/& i ) requires ranges::random_access_range<Base>; | (2) | (since C++23)
friend constexpr /*iterator*/ operator-( const /*iterator*/& i, difference_type n ) requires ranges::random_access_range<Base>; | (3) | (since C++23)
friend constexpr difference_type operator-( const /*iterator*/& i, const /*iterator*/& j ) requires std::sized_sentinel_for<ranges::iterator_t<Base>, ranges::iterator_t<Base>>; | (4) | (since C++23)

Performs iterator arithmetic.

1,2) Equivalent to: auto r = i; r += n; return r;.
3) Equivalent to: auto r = i; r -= n; return r;.
4) Let `current_` and `last_ele_` be the underlying iterators to the begin and end of the sliding window, respectively. Equivalent to:

- return x.last_ele_ - y.last_ele_;, if `last_ele_` is present. Otherwise,
- return x.current_ - y.current_;.

These functions are not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when `slide_view::iterator<Const>` is an associated class of the arguments.

### Parameters

i, j | - | the iterators
n | - | position relative to current location

### Return value

1,2) An incremented iterator.
3) A decremented iterator.
4) A distance between given iterators.

### Example

| This section is incomplete Reason: no example

### See also

operator++operator++(int)operator--operator--(int)operator+=operator-= | advances or decrements the underlying iterators (public member function)

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